Umlaut URL parameters
Umlaut has a few custom URL parameters (can also be sent in a POST request) to control Umlaut behavior. All start with the prefix "umlaut.". These are generally added onto an OpenURL GET request.
Specify an Umlaut Referent object to re-use. Umlaut referent object represents a particular citation. Unlike umlaut.request_id, won't re-use an entire request (with responses and state), but only the specified citation.
Set to "false" to override umlaut's configuration for conditionally skipping the the resolve menu and going straight to content. umlaut.skip_resolve_menu=false forces display of full resolve menu.
Set to the name(s) of Umlaut service types (comma delimited), to force menu skipping (direct linking) for the first response found from any of the service types named.
Set to "false" to force direct linking *without* the banner/frameset, just direct to vendor url.
Generally used for API requests, value can be "xml", "json", or "jsonp". In case of jsonp, umlaut.jsonp=jsFunctionName can be used to determine the js function name that will be generated with the jsonp output